A quick overview of how a combined sewer overflow system works, and why heavy rains can be bad for estuaries. [1:42]

In this video segment adapted from 'Need to Know,' learn about health concerns regarding exposure to chemicals used in natural gas drilling. An animation shows how the process of hydraulic fracturing-fracking-is used to extract natural...

Modern farming has helped feed the world, but along the way, the land has suffered, according to this video adapted from the series 'Race to Save the Planet.' When farmers grow too much too fast, topsoil is depleted. Farmers can work...